WO1997017618A1 - Process for checking parts of motor vehicle systems - Google Patents
Process for checking parts of motor vehicle systems Download PDFInfo
- Publication number
- WO1997017618A1 WO1997017618A1 PCT/DE1996/001242 DE9601242W WO9717618A1 WO 1997017618 A1 WO1997017618 A1 WO 1997017618A1 DE 9601242 W DE9601242 W DE 9601242W WO 9717618 A1 WO9717618 A1 WO 9717618A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- test
- motor vehicle
- starting conditions
- tank ventilation
- test functions
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
Definitions
- the invention relates to a method for checking subsystems in motor vehicles which are equipped with on-board diagnostic systems at the end of the manufacturing process and in the case of customer services.
- a driving curve consisting of operating points with predetermined values of load, speed and possibly further parameters is traversed on a test bench under defined conditions, the driving curve being defined in such a way that the on-board diagnostic programs are processed independently. If an exhaust gas-relevant error is registered, this is stored in the control unit as an error message and is signaled to the outside during or after the test run, for example via an external tester, so that measures for eliminating the error can be taken.
- Reading out self-test information in connection with a tape end control is known, for example, from VDI reports 612, page 392.
- the system presented there relates to the expansion of existing control units with a suitable interface with the aim of making the information from the self-test of the control unit transparent, for example to a service technician.
- the object of the invention is to specify a device which is used to shorten this test time while maintaining the utilization of the on-board diagnostic functions implemented in the known device. This object is achieved with the features of claim 1.
- the device according to the invention enables a simple function check of subsystems such as secondary air injection and tank ventilation, including all relevant components with a reduced test time.
- the use of existing diagnostic functions saves the implementation of a accurate diagnostic functions intended only for the end-of-line or customer service check. This is accompanied by a reduction in the programming effort and an overall optimized structure of the control program of the diagnostic device.
- FIG. 1 shows an internal combustion engine with a tank ventilation system and a secondary air system as an example of subsystems which are to be checked with on-board means.
- FIG. 2 shows an exemplary embodiment of method steps through which the control device 4 from FIG. 1 works as a device according to the invention.
- FIG. 1 in FIG. 1 denotes an internal combustion engine with an intake manifold 2, an exhaust pipe 3, a tank ventilation system, a secondary air system 15 and a control device 4 and an external test device 5.
- the tank ventilation system comprises a tank 6, an activated carbon filter 7 and a tank ventilation valve 8.
- Means 9 for detecting the air quantity m drawn in by the internal combustion engine, a throttle valve 10, a bypass to the throttle valve with an idle actuator 11 and a fuel metering means 12 are mounted in the intake manifold 2.
- a speed sensor 13 on the internal combustion engine and an exhaust gas sensor 14 in the exhaust pipe of the internal combustion engine are shown as representative of further sensors for detecting operating parameters of the internal combustion engine.
- An external test device 5 communicates with the vehicle control device 4 via an interface 15.
- the control device 4 mediates between the sensors and final control elements shown in a preprogrammed manner. For example, the amount m of air drawn in is normalized to individual strokes by division by the speed n of the internal combustion engine, and a base value for controlling the fuel metering means 12 is formed therefrom. This base value is corrected as a function of the signal from the exhaust gas sensor 14 so that a desired value of the lambda composition of the fuel / air mixture burned in the internal combustion engine is established on average over time. In parallel to this mixture control loop, an idle control loop consisting of a speed sensor and idle control element 11 works. If the speed drops below a setpoint, the control unit 4 increases the amount of air sucked in by the internal combustion engine via the idle speed control and thus increases its speed.
- Evaporated fuel in the tank 6 is temporarily stored in the activated carbon filter 7.
- the tank ventilation valve 8 is opened in accordance with control instructions from the control unit 4, so that air is sucked in via the activated carbon filter, which entrains the temporarily stored fuel and feeds it to the combustion.
- the tank ventilation system does not work, for example, when the tank ventilation valve is closed defectively.
- the opening control of the tank ventilation valve causes the fuel / air mixture supplied to the internal combustion engine to be enriched, which gas sensor is registered.
- the activated carbon filter is not loaded with fuel, pure air is drawn in via the tank ventilation valve, which leads to an increase in speed when the idle speed control is switched off. If neither a lambda nor a speed reaction occurs, this is evaluated as an error and, for example, an error message indicating this error is output or stored.
- the secondary air system can be checked, for example, by observing the reaction of the lambda probe to the blowing in of air.
- These on-board diagnostic programs are triggered by the control unit 4 in normal operation when certain starting conditions exist.
- this check is not carried out in everyday operation until some time after the internal combustion engine has started, which leads to an undesirable expenditure of time when using the on-board diagnosis at the end of the line.
- the diagnostic device is designed in such a way that a signal can be coupled in, by means of which the triggering and / or the sequence of the diagnostic functions can be modified.
- a known, OBD-capable control device has an interface via which data, for example error messages that occur during the diagnostic process, are passed on to an external tester.
- the device according to the invention is also programmed such that the starting conditions under which the diagnosis is triggered can be bypassed by a signal from the tester.
- it can be provided to modify the course of the diagnostic method by changing certain test parameters.
- An embodiment of the device according to the invention operates in the manner shown in the left half of FIG. 2. The right half illustrates method steps that run in parallel in an external test device during the work of the device according to the invention, which is connected via an interface to the device according to the invention.
- control unit After starting the internal combustion engine, the control unit works in a main program (block SI) in which, for example, processes such as triggering the ignition and injection time calculations are coordinated.
- a variable Bfa which can assume values zero or one, has the standard value zero after the start and a set of test parameters has standard values al, ...,.
- a step S2 it is checked whether the variable Bfa has the value one.
- This query is denied in everyday operation, which is regarded as an input requirement (step S3) for the usual on-board diagnosis.
- step S4 it is then checked in step S4 whether certain starting conditions for triggering the on-board diagnosis are met. Examples of such conditions are the presence of a minimum cooling water temperature, the expiry of a certain time after the start of the internal combustion engine, etc. As long as these conditions are not met, the main program is returned.
- step S5 If, on the other hand, these conditions are met, the set of test parameters al, ..., on is read in in a step S5 and the normal OBD function is carried out with these test parameters in a step S6.
- the result of the diagnosis is evaluated in step S7, in which an error lamp MIL is switched on in the case of serious errors or an error counter reading is increased in the case of less serious errors.
- the main program is then continued in step S8.
- step S9 a tape end diagnosis mode
- step S9 bypasses the starting conditions to which the diagnosis is linked in everyday operation.
- test parameters can also be changed in this branch.
- Step T2 serves this purpose, in which the external test device activates a changed set of test parameters bl,..., Bn in control device 4 or transfers them to the control device.
- the control unit 4 uses this changed set (step S10) in step S6 to process the otherwise unchanged OBD function. If errors occur, they are determined in step S7 and signaled to the external tester.
- test device 5 can be triggered without delay by avoiding waiting times.
- the signal coupled in by the test device 5 can also serve to suppress the independent triggering of OBD functions on the part of the control device.
- the invention is not limited to a diagnosis of the tank ventilation or the secondary air injection, but can in principle be used in connection with any OBD function of other subsystems. Examples of other subsystems that are suitable for this are the fuel supply system, catalyst monitoring, monitoring of the lambda sensor for aging, the load detection system, a system for detecting misfires, diagnosis of sensors. It is essential above all that the on-board diagnostic function can be triggered by an external test device independently of other starting conditions and its process can be modified if necessary.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/875,248 US6032088A (en) | 1995-11-03 | 1996-07-10 | Method for checking vehicle component systems in motor vehicles |
DE59611492T DE59611492D1 (en) | 1995-11-03 | 1996-07-10 | METHOD FOR VERIFYING VEHICLE PARTS SYSTEMS IN MOTOR VEHICLES |
KR1019970704566A KR100603478B1 (en) | 1995-11-03 | 1996-07-10 | Process for checking Parts of Motor Vehicle Systems |
EP96922760A EP0804741B1 (en) | 1995-11-03 | 1996-07-10 | Process for checking parts of motor vehicle systems |
JP51772597A JP3795084B2 (en) | 1995-11-03 | 1996-07-10 | On-board diagnostic device for inspecting automotive partial devices |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19540943A DE19540943A1 (en) | 1995-11-03 | 1995-11-03 | Method for checking vehicle subsystems in motor vehicles |
DE19540943.4 | 1995-11-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997017618A1 true WO1997017618A1 (en) | 1997-05-15 |
Family
ID=7776501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001242 WO1997017618A1 (en) | 1995-11-03 | 1996-07-10 | Process for checking parts of motor vehicle systems |
Country Status (6)
Country | Link |
---|---|
US (1) | US6032088A (en) |
EP (1) | EP0804741B1 (en) |
JP (1) | JP3795084B2 (en) |
KR (1) | KR100603478B1 (en) |
DE (2) | DE19540943A1 (en) |
WO (1) | WO1997017618A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19857462A1 (en) * | 1998-12-12 | 2000-06-15 | Volkswagen Ag | Method to test individual components of vehicle; involves measuring data for all components that affect individual component in different operating states and generating signal course for individual component |
WO2004061405A2 (en) * | 2002-12-20 | 2004-07-22 | Siemens Aktiengesellschaft | Method and device for fault analysis of motor vehicle control units and corresponding control unit |
DE102006027551A1 (en) * | 2006-06-14 | 2007-12-27 | Audi Ag | Information e.g. quiescent current behavior, recording method for motor vehicle i.e. car, involves wirelessly transmitting trigger signal to vehicle sided receiving device for information query by using vehicle external signaling device |
DE102012207342A1 (en) * | 2012-05-03 | 2013-11-07 | Bayerische Motoren Werke Aktiengesellschaft | Error analyzing device of error analysis system for determining causes of errors in successive process for assembling and operation of e.g. truck, has interface that is communication with movement system to detect vehicle system time |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19723831A1 (en) * | 1997-06-06 | 1998-12-10 | Eberspaecher J Gmbh & Co | Diagnostic device for checking a subsystem of a motor vehicle |
DE19743954C2 (en) * | 1997-10-04 | 2000-10-12 | Wwu Wissenschaftliche Werkstat | Cold start measuring system for measuring the cold start emission |
JP3141933B2 (en) * | 1997-09-05 | 2001-03-07 | 株式会社デンソー | Automatic toll collection system |
DE19910486A1 (en) * | 1999-03-10 | 2000-09-14 | Bielomatik Leuze & Co | Device and method for checking the flow of a container connection |
DE10036391B4 (en) * | 2000-07-26 | 2010-04-15 | Volkswagen Ag | Vehicle monitoring system |
DE10039965A1 (en) * | 2000-08-16 | 2002-02-28 | Siemens Ag | Method and arrangement for exhaust gas analysis on motor vehicles with on-board engine control and diagnostic system |
DE10119270A1 (en) * | 2001-04-20 | 2002-10-24 | Zahnradfabrik Friedrichshafen | Measurement arrangement for motor vehicle data has measurement sensors and electronics for recording and processing measurement data and characteristic values for the vehicle and a control box that automates the whole process |
US7012512B2 (en) * | 2004-04-14 | 2006-03-14 | St Denis Michael | OBDII readiness status notification device |
US8370016B2 (en) * | 2005-09-23 | 2013-02-05 | Spx Corporation | OBD II readiness monitor tool apparatus and method |
US8027763B2 (en) * | 2005-09-23 | 2011-09-27 | Spx Corporation | OBD II readiness monitor tool apparatus and method |
US7643916B2 (en) | 2006-06-14 | 2010-01-05 | Spx Corporation | Vehicle state tracking method and apparatus for diagnostic testing |
US8423226B2 (en) * | 2006-06-14 | 2013-04-16 | Service Solutions U.S. Llc | Dynamic decision sequencing method and apparatus for optimizing a diagnostic test plan |
US8428813B2 (en) | 2006-06-14 | 2013-04-23 | Service Solutions Us Llc | Dynamic decision sequencing method and apparatus for optimizing a diagnostic test plan |
US20070293998A1 (en) * | 2006-06-14 | 2007-12-20 | Underdal Olav M | Information object creation based on an optimized test procedure method and apparatus |
US9081883B2 (en) | 2006-06-14 | 2015-07-14 | Bosch Automotive Service Solutions Inc. | Dynamic decision sequencing method and apparatus for optimizing a diagnostic test plan |
US8762165B2 (en) | 2006-06-14 | 2014-06-24 | Bosch Automotive Service Solutions Llc | Optimizing test procedures for a subject under test |
US20100324376A1 (en) * | 2006-06-30 | 2010-12-23 | Spx Corporation | Diagnostics Data Collection and Analysis Method and Apparatus |
US20090216584A1 (en) * | 2008-02-27 | 2009-08-27 | Fountain Gregory J | Repair diagnostics based on replacement parts inventory |
US20090216401A1 (en) * | 2008-02-27 | 2009-08-27 | Underdal Olav M | Feedback loop on diagnostic procedure |
US8239094B2 (en) * | 2008-04-23 | 2012-08-07 | Spx Corporation | Test requirement list for diagnostic tests |
JP2010174872A (en) * | 2009-02-02 | 2010-08-12 | Denso Corp | Malfunction diagnosis device for internal combustion engine secondary air supply system |
US8648700B2 (en) * | 2009-06-23 | 2014-02-11 | Bosch Automotive Service Solutions Llc | Alerts issued upon component detection failure |
US9829894B2 (en) | 2012-03-24 | 2017-11-28 | Audi Ag | Method for operating a tank device, and corresponding tank device |
DE102012019645A1 (en) * | 2012-10-06 | 2014-04-10 | Volkswagen Aktiengesellschaft | Method for testing circuit in safety-critical systems of vehicle, involves testing circuit from time point, at which processing is completed, within target time period |
GB2543852A (en) * | 2015-11-02 | 2017-05-03 | Caterpillar Inc | Method for end of line testing of a vehicle with a work implement |
DE102015221814A1 (en) * | 2015-11-06 | 2017-05-11 | Robert Bosch Gmbh | Method for carrying out a diagnostic procedure in a motor vehicle |
KR102198725B1 (en) | 2019-06-27 | 2021-01-06 | 주식회사 글로비즈 | Vehicle driving safety parts self-diagnostic apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267569A (en) * | 1978-06-02 | 1981-05-12 | Robert Bosch Gmbh | Micro-computer system for control and diagnosis of motor vehicle functions |
WO1990013738A1 (en) * | 1989-05-02 | 1990-11-15 | Robert Bosch Gmbh | A process and device for diagnosing the control of the tank ventilation valve in connection with the control of an internal combustion engine |
US5005129A (en) * | 1988-02-29 | 1991-04-02 | Fuji Jukogyo Kabushiki Kaisha | Diagnosis system for a motor vehicle |
EP0553472A2 (en) * | 1992-01-31 | 1993-08-04 | Robert Bosch Gmbh | Process and appliance for testing an apparatus which comprises at least one microprocessor |
DE4333009A1 (en) * | 1993-09-28 | 1995-03-30 | Siemens Ag | Method and circuit arrangement for testing an engine control device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3624441A1 (en) * | 1986-07-19 | 1988-01-28 | Bosch Gmbh Robert | Diagnostic method for quantitative testing of actuators in internal-combustion engines |
US5506773A (en) * | 1992-08-11 | 1996-04-09 | Nippondenso Co., Ltd. | Self-diagnosing apparatus for motor vehicles |
US5671141A (en) * | 1993-04-05 | 1997-09-23 | Ford Global Technologies, Inc. | Computer program architecture for onboard vehicle diagnostic system |
US5737711A (en) * | 1994-11-09 | 1998-04-07 | Fuji Jukogyo Kabuishiki Kaisha | Diagnosis system for motor vehicle |
-
1995
- 1995-11-03 DE DE19540943A patent/DE19540943A1/en not_active Ceased
-
1996
- 1996-07-10 US US08/875,248 patent/US6032088A/en not_active Expired - Lifetime
- 1996-07-10 KR KR1019970704566A patent/KR100603478B1/en not_active IP Right Cessation
- 1996-07-10 DE DE59611492T patent/DE59611492D1/en not_active Expired - Lifetime
- 1996-07-10 WO PCT/DE1996/001242 patent/WO1997017618A1/en not_active Application Discontinuation
- 1996-07-10 EP EP96922760A patent/EP0804741B1/en not_active Expired - Lifetime
- 1996-07-10 JP JP51772597A patent/JP3795084B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267569A (en) * | 1978-06-02 | 1981-05-12 | Robert Bosch Gmbh | Micro-computer system for control and diagnosis of motor vehicle functions |
US5005129A (en) * | 1988-02-29 | 1991-04-02 | Fuji Jukogyo Kabushiki Kaisha | Diagnosis system for a motor vehicle |
WO1990013738A1 (en) * | 1989-05-02 | 1990-11-15 | Robert Bosch Gmbh | A process and device for diagnosing the control of the tank ventilation valve in connection with the control of an internal combustion engine |
EP0553472A2 (en) * | 1992-01-31 | 1993-08-04 | Robert Bosch Gmbh | Process and appliance for testing an apparatus which comprises at least one microprocessor |
DE4333009A1 (en) * | 1993-09-28 | 1995-03-30 | Siemens Ag | Method and circuit arrangement for testing an engine control device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19857462A1 (en) * | 1998-12-12 | 2000-06-15 | Volkswagen Ag | Method to test individual components of vehicle; involves measuring data for all components that affect individual component in different operating states and generating signal course for individual component |
WO2004061405A2 (en) * | 2002-12-20 | 2004-07-22 | Siemens Aktiengesellschaft | Method and device for fault analysis of motor vehicle control units and corresponding control unit |
WO2004061405A3 (en) * | 2002-12-20 | 2005-02-17 | Siemens Ag | Method and device for fault analysis of motor vehicle control units and corresponding control unit |
DE102006027551A1 (en) * | 2006-06-14 | 2007-12-27 | Audi Ag | Information e.g. quiescent current behavior, recording method for motor vehicle i.e. car, involves wirelessly transmitting trigger signal to vehicle sided receiving device for information query by using vehicle external signaling device |
DE102006027551B4 (en) * | 2006-06-14 | 2008-06-26 | Audi Ag | Method for recording vehicle information during vehicle production for test purposes, and device suitable therefor |
DE102012207342A1 (en) * | 2012-05-03 | 2013-11-07 | Bayerische Motoren Werke Aktiengesellschaft | Error analyzing device of error analysis system for determining causes of errors in successive process for assembling and operation of e.g. truck, has interface that is communication with movement system to detect vehicle system time |
Also Published As
Publication number | Publication date |
---|---|
KR100603478B1 (en) | 2006-10-24 |
US6032088A (en) | 2000-02-29 |
EP0804741B1 (en) | 2009-04-15 |
JPH10512963A (en) | 1998-12-08 |
DE59611492D1 (en) | 2009-05-28 |
JP3795084B2 (en) | 2006-07-12 |
EP0804741A1 (en) | 1997-11-05 |
KR987001089A (en) | 1998-04-30 |
DE19540943A1 (en) | 1997-05-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0804741A1 (en) | Process for checking parts of motor vehicle systems | |
DE10257869B4 (en) | Fault determination system and method for an internal combustion engine and engine control unit | |
DE4302779C2 (en) | Method for checking the functionality of exhaust gas catalysts used in the exhaust gas system of motor vehicles equipped with an internal combustion engine | |
EP3717757A1 (en) | Method for operating an exhaust gas aftertreatment system of an internal combustion engine, and exhaust gas aftertreatment system | |
EP1192340B1 (en) | Method for verifying a catalytic exhaust box of an internal combustion engine | |
DE102007062794B4 (en) | Method and device for detecting a leak in an exhaust section of an internal combustion engine | |
DE102005001119A1 (en) | Method for operation of internal combustion engine involves exhaust gas treatment device arranged in exhaust area whereby reagent is introduced in exhaust area before exhaust treatment device in direction of flow | |
WO1990011443A1 (en) | Process and device for checking the controllability of a tank ventilation valve | |
DE10254843A1 (en) | Method of monitoring motor vehicle exhaust gas cleaning system involves injecting urea-water mix into exhaust to determine if sensor output varies | |
EP1561019A1 (en) | Method for testing at least three sensors, which detect a measurable variable for an internal combustion engine | |
WO2013098305A1 (en) | Method for specifying a malfunction of an exhaust gas recirculation system of a motor vehicle internal combustion engine, and corresponding diagnostic device | |
EP3527810A1 (en) | Method for operating a combustion engine | |
DE3914536C2 (en) | Method and device for diagnosing actuators in the regulation and / or control of operating parameters in connection with the idle control and the tank ventilation in internal combustion engines | |
DE102008000691A1 (en) | Method and device for monitoring a supply air system of an internal combustion engine | |
DE19946874A1 (en) | Logical diagnostic procedure determining causes of defective air fuel mixture supply to engine, forms paired comparisons of measurements at differing loading conditions | |
DE4309854C2 (en) | Method and device for controlling the secondary air supply for an internal combustion engine | |
EP1180594A2 (en) | Method for testing an exhaust gas recirculation system | |
WO2019120904A1 (en) | Method and device for determining the degree of fouling of an air filter of an internal combustion engine | |
EP1609970B1 (en) | Method and device to operate an internal combustion engine | |
DE102011081634B4 (en) | Method and device for diagnosing a fault in an exhaust gas recirculation system | |
DE4225361A1 (en) | Functional testing of secondary air admission into IC engine exhaust - involves measuring lambda value of exhaust gases by sensor supplying electronic control unit for secondary air pump and valve | |
DE19713180C1 (en) | Method for monitoring the secondary air mass flow of an exhaust gas cleaning system | |
DE102007006487B4 (en) | Method for diagnosing an exhaust gas sensor arranged in an exhaust region of an internal combustion engine and device for carrying out the method | |
DE102007035168A1 (en) | Monitoring a cam profile switching system in internal combustion engines | |
DE10118675C1 (en) | Function testing method for engine exhaust bypass line element uses analysis of exhaust gas temperature data obtained upon opening bypass element |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 1996922760 Country of ref document: EP |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 08875248 Country of ref document: US Ref document number: 1019970704566 Country of ref document: KR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1996922760 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1019970704566 Country of ref document: KR |
|
WWR | Wipo information: refused in national office |
Ref document number: 1019970704566 Country of ref document: KR |